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A particle separator includes a first housing and a second housing. The first housing extends along an axis from an open proximal end to an open distal end. The second housing has a closed proximal end disposed adjacent the open proximal end of the outer housing. The second housing extends from the

A particle separator includes a first housing and a second housing. The first housing extends along an axis from an open proximal end to an open distal end. The second housing has a closed proximal end disposed adjacent the open proximal end of the outer housing. The second housing extends from the closed proximal end into the first housing along substantially a same axis as the axis of the first housing. The second housing has one or more passages disposed at a distance from the closed proximal end of the second housing. Additionally, the one or more passages are disposed within the first housing at a distance from the open proximal end thereof.

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1. A particle separator comprising: a first housing extending along an axis from an open proximal end to an open distal end; anda second housing extending into the first housing, wherein the second housing has a plurality of passages therein, the plurality of passages are disposed within the first h

1. A particle separator comprising: a first housing extending along an axis from an open proximal end to an open distal end; anda second housing extending into the first housing, wherein the second housing has a plurality of passages therein, the plurality of passages are disposed within the first housing at a distance from the open proximal end thereof. 2. The particle separator of claim 1, wherein the second housing has a closed proximal end disposed adjacent the open proximal end of the outer housing. 3. The particle separator of claim 1, wherein the open proximal end of the first housing includes a bell-mouth and the first housing has a hollow tubular shape. 4. The particle separator of claim 1, wherein the plurality of passages extend through a side surface of the second housing that is disposed within the first housing. 5. The particle separator of claim 4, wherein the plurality of passages are disposed substantially 90 degrees to a direction of an air flow passing through the first housing such that air flow must change flow direction to pass through the plurality of passages and enter the second housing. 6. The particle separator of claim 1, wherein the plurality of passages of comprise a plurality of slots disposed at a distance from one another along the second housing, each slot has a width of between about 0.05 and 0.10 inches (0.1 and 0.2 cm). 7. The particle separator of claim 6, wherein the slots are offset from one another such that each slot terminates in a different position along a circumference of the second housing. 8. The particle separator of claim 1, wherein a proximal portion of the second housing is coaxially positioned within the first housing. 9. The particle separator of claim 8, wherein a side surface of the second housing extends substantially parallel to a side wall of the first housing, and wherein the plurality of passages extend through the side surface of the second housing. 10. The particle separator of claim 9, wherein the second housing has at least one elbow portion and the second housing extends through the side wall of the first housing. 11. An assembly for cooling a ram air fan comprising: the ram air fan having one or more internal components that generate heat during operation; anda shrouded particle separator in flow communication with the components of the ram air fan, the shrouded particle separator having a first housing with an open proximal end and a second housing having a portion disposed within the first housing, wherein the second housing has a plurality of passages therein, the passages are disposed within the first housing at a distance from the open proximal end thereof. 12. The assembly of claim 11, wherein the open proximal end of the first housing includes a bell-mouth and the first housing has a hollow tubular shape. 13. The assembly of claim 11, wherein the plurality of passages extend through a side surface of the second housing that is disposed within the first housing. 14. The assembly of claim 11, wherein the plurality of passages are disposed substantially 90 degrees to a direction of an air flow passing through the first housing such that air flow must change flow direction to pass through the plurality of passages and enter the second housing. 15. The assembly of claim 11, wherein the second housing has a closed proximal end disposed adjacent the open proximal end of the outer housing. 16. The assembly of claim 11, wherein a side surface of the second housing extends substantially parallel to a side wall of the first housing, and wherein the plurality of passages extend through the side surface of the second housing. 17. An environmental control system comprising: one or more components that generate heat during operation;a shrouded particle separator in flow communication with the one or more component, the shrouded particle separator having a first housing with an open proximal end and a second housing having a portion disposed within the first housing, wherein the second housing has a plurality of passages therein, the passages disposed within the first housing at a distance from the open proximal end thereof. 18. The environmental control system of claim 17, wherein the plurality of passages are disposed substantially 90 degrees to a direction of an air flow passing through the first housing such that air flow must change flow direction to pass through the plurality of passages and enter the second housing. 19. The environmental control system of claim 17, wherein the second housing has a closed proximal end disposed adjacent the open proximal end of the outer housing. 20. The environmental control system of claim 17, wherein a side surface of the second housing extends substantially parallel to a side wall of the first housing, and wherein the plurality of passages extend through the side surface of the second housing.